Resonance-type non-contact power supply system

• US 9,577,715 B2
• Filed: 05/11/2012
• Issued: 02/21/2017
• Est. Priority Date: 06/17/2011
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Inventors: Taguchi, Yuichi, Yamaguchi, Atsushi
• Primary Examiner(s): Gannon, Levi
• Application Number:
  US14/125,795
• Publication Number:
  US 20140175897A1
• Time in Patent Office: 1,747 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A resonance system that receives power from a power source section is configured by at least a primary resonance coil, a secondary resonance coil, and a load. The output frequency f_o of the power source section is set to lie within one of the frequency ranges f₁≦f_n≦f₂, f₃≦f_o≦f₄, . . . , f_2n-1≦f_o≦f_2n. The frequencies f₁, f₂, f₃, f₄, . . . , f_2n-1, f_2n (f₁<f₂<f₃< . . . <f_2n-1<f_2n) are defined such that, if the input impedances of the resonant system at the time of supply of power of the frequencies f₁, f₂, f₃, f₄, . . . f_2n-1, f_2n (f₁<f₂<f₃< . . . <f_2n-1<f_2n) to the resonant system are represented by Z₁, Z₂, Z₃, . . . , Z_2n-1, Z_2n, the input impedances satisfy Z₁=Z₂, Z₃=Z₄, . . . , Z_2n-1=Z_2n.

Claims

1. A resonance-type non-contact power supply system comprising:

power supply equipment including a power source section and a primary resonance coil configured to be supplied with power from the power source section; and

power receiving equipment including a secondary resonance coil configured to receive power from the primary resonance coil by magnetic field resonance and a load configured to be supplied with power received at the secondary resonance coil, wherein

the primary resonance coil, the secondary resonance coil, and the load constitute a resonant system,

wherein within a predetermined range of frequencies, at least one combination of two frequencies of the power source section is determined, at which input impedances of the resonant become equal, the at least one combination including the frequencies which are defined f_2n-1 and f_2n with f_2n-1<

f_2n, which are defined such that, if the input impedances of the resonant system at the time of supply of power of the frequencies f_2n-1 and f_2n to the resonant system are represented by Z_2n-1 and Z_2n, equal input impedances of the resonant system satisfy Z_2n-1=Z_2n, where n is a natural number,

the output frequencies f_o of the power source section is set to lie within the frequency range between the two frequencies to satisfy f_2n-1≦

f_o≦

f_2n, and

the load includes a rectifier and a battery,

wherein real parts of the input impedances Z_2n-1 and Z_2n represented by R_2n-1 and R_2n, and imaginary parts of the input impedances Z_2n-1 and Z_2n are represented by X_2n-1 and X_2n, and

when the condition Z_2n-1=Z_2n is met, the real parts and the imaginary parts are set as follows;

R_2n-1=R_2n and X_2n-1=X_2n≠

0.

2. The resonance-type non-contact power supply system according to claim 1, wherein

at least one of the power supply equipment and the power receiving equipment is provided with an induction coil configured to supply power received from the power source section to the primary resonance coil by electromagnetic induction or with an induction coil configured to draw power received at the secondary resonance coil by electromagnetic induction, and

at least the induction coil, the primary resonance coil, the secondary resonance coil, and the load constitute the resonant system.

3. The resonance-type non-contact power supply system according to claim 2, wherein the induction coil is provided in each of the power supply equipment and the power receiving equipment.

4. The resonance-type non-contact power supply system according to claim 1, wherein the power supply equipment includes a matching device for matching the input impedance of the resonant system with the impedance on the power source section side as viewed from the input end of the resonant system and a matching device control section for adjusting the matching device.